package controller;


import com.fasterxml.jackson.databind.ObjectMapper;
import model.Blog;
import model.BlogDao;
import model.User;
import model.UserDao;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebServlet("/authorInfo")
public class AuthorServlet extends HttpServlet {
    private ObjectMapper objectMapper=new ObjectMapper();

    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        resp.setContentType("application/json,charset=utf8");
        //通过这个方法,来获取到指定博客的作者信息
        String param=req.getParameter("blogId");
        if(param==null||"".equals(param)){
            //参数缺少了
            resp.getWriter().write("{\"ok\":false,\"reason\":\"参数缺失!\"}");
            return;
        }

        //根据当前 blogId 在数据库中进行查找,找到对应的Blog对象,再进一步的根据blog对象,找到作者信息
        BlogDao blogDao=new BlogDao();
        Blog blog=blogDao.selectOne(Integer.parseInt(param));
        if(blog==null){
            resp.getWriter().write("{\"ok\":false,\"reason\":\"要查询的博客不存在!\"}");
            return;
        }

        //根据blog对象,查询到用户对象
        UserDao userDao=new UserDao();
        User author=userDao.selectById(blog.getUserId());
        if(author==null){
            resp.getWriter().write("{\"ok\":false,\"reason\":\"要查询的用户不存在!\"}");
            return;
        }

        //把author返回到浏览器这边
        //注意:去掉密码
        author.setPassward("");
        resp.getWriter().write(objectMapper.writeValueAsString(author));
    }
}
